MCQ
Dobereiner traids is
- A$Na$, $K$, $Rb$
- B$Mg,$$S,$$As$
- ✓$Cl$, $Br,I$
- D$P,$$S,$, $As$

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$\mathop {C{H_2} = C{H_2}}\limits_{(I)} $ $\mathop {C{H_3} - CH = C{H_2}}\limits_{(II)} $ (figure) $\mathop {C{H_2} = CH - Cl}\limits_{(IV)} $
Assertion $A :$- Carbon forms two important oxides $- CO$ and $CO _2 . CO$ is neutral whereas $CO _2$ is acidic in nature.
Reason $R :$- $CO _2$ can combine with water in a limited way to form carbonic acid, while $CO$ is sparingly soluble in water.
In the light of the above statements, choose the most appropriate answer from the options given below :-
$X-Y-Z$